Amana SZC 160241 - User Manual

This document is an installation and service reference manual for a Condensing Unit Heat Pump, covering models from 2020-2023 manufactured by Daikin Comfort Technologies Manufacturing, L.P. It provides essential information for qualified personnel regarding the safe and proper installation, operation, and maintenance of the equipment.

Function Description

The condensing unit heat pump is designed for residential and light commercial applications, providing both heating and cooling. It can operate as part of a fully communicating HVAC system utilizing ComfortBridge™ compatible indoor units, or as a non-communicating (legacy) system with 24 VAC inputs and outputs. The system manages airflow demands based on the operating mode, with either the indoor unit, outdoor unit, or thermostat determining the airflow demand for the ECM motor.

Important Technical Specifications

Refrigerant: The units are designed for R-410A refrigerant.
Electrical: The unit's rating plate lists pertinent electrical data for proper service and overcurrent protection. Wires should be sized to limit voltage drop to 2% (max.) from the main breaker or fuse panel.
Overcurrent Protection: Approved devices include time delay fuses and HACR type circuit breakers.
Low Voltage Control: For communicating systems, only two low voltage control wires are required between the outdoor and indoor units. For non-communicating systems, the outdoor unit transformer must be disconnected from low and line voltage connections.
Defrost Time Interval: For non-communicating systems, defrost time intervals can be selected via dipswitch settings (30, 60, 90, 120 minutes). The factory default is 30 minutes, with a maximum defrost cycle time of 10 minutes.
Refrigerant Charge: Adequate refrigerant charge for the matching evaporator coil or air handler and 15 feet of lineset is supplied with the condensing unit. For linesets exceeding 15 feet, refrigerant should be added at 0.6 ounces per foot of liquid line.
Subcooling: TXV-based systems should have a Subcooling value of 6°F +/- 1°F.
Superheat: TXV-based systems should have a Superheat value of 8°F +/- 1°F.
Low Speed Lock-Out: The outdoor system has a low speed lock-out feature. In communicating mode, below 37°F outdoor ambient, the system locks out low stage and operates only in high stage to provide maximum heating capacity.
Airflow Profiles: The system offers four cooling airflow profiles (A, B, C, D) with varying ramp-up and OFF delay characteristics to optimize cooling demand airflow.
Line Set Length: Recommended interconnecting tubing sizes are provided for line lengths of 0-24 ft, 25-49 ft, and 50-79 ft. For runs exceeding 79 feet or with vertical elevation changes over 50 feet, refer to TP-107 Long Line Set Application R-410A guidelines.

Usage Features

Safety: The manual emphasizes critical safety instructions, including warnings about high voltage, proper refrigerant handling, and the need for trained personnel for installation and servicing. It also warns against using scroll compressors to evacuate the AC system due to potential damage.
Shipping Inspection: Users are instructed to keep the unit upright during shipping, verify model numbers and specifications, and report any shipping damage to the carrier.
Codes & Regulations: The product complies with national codes, and installers are responsible for adhering to local codes and EPA regulations regarding refrigerants.
Installation: Detailed instructions are provided for site selection, including minimum elevation recommendations for severe weather, and considerations for rooftop installations to minimize vibration and noise.
Refrigerant Line Handling: Guidelines include using only refrigerant-grade copper tubing, keeping tubing clean and dry, cutting ends square, and preventing direct contact with building structures. Insulation of the suction line is required to prevent condensation.
Brazing: Instructions for brazing include using a wet rag or thermal heat trap compound to protect components, using a 2% minimum silver content brazing alloy, and sweeping lines with nitrogen to prevent copper-oxide formation.
Leak Testing: The system should be pressurized with dry nitrogen to 450 PSIG and checked for leaks using soapy water or an electronic leak detector.
System Evacuation: The Deep Vacuum Method is recommended, requiring a vacuum pump rated for 500 microns or less. The system should be evacuated to less than 500 microns and hold vacuum for 10 minutes.
Electrical Connections: Wiring must conform to NEC or CEC and local codes. The manual specifies routing power and ground wires through the high voltage port and control wires through the low voltage port.
System Start-Up: Service valves should be opened until the top of the stem is 1/8" from the retainer to avoid refrigerant loss.
Charge Verification and Adjustment: The manual outlines procedures for checking airflow and total static pressure, and for adjusting refrigerant charge using subcooling for TXV-equipped coils or superheat for adjustable TXVs.
Heat Pump - Heating Cycle: Charging in heat mode is done by weight, with adjustments for line size and length. Final charge adjustments are made in the cooling cycle.
ComfortBridge™ System: This advanced feature enables digital communication between indoor and outdoor units, allowing access to additional system information, advanced setup, and diagnostic/troubleshooting features via push buttons or the CoolCloud mobile app.
Fault Code History: The system stores the last six faults detected, providing diagnostic information for troubleshooting.

Maintenance Features

Routine Maintenance: Bi-annual maintenance checkups by a qualified servicer are strongly recommended before heating and cooling seasons.
Filter Replacement/Cleaning: Filters must be used and checked monthly. Dirty filters should be replaced or cleaned to prevent efficiency loss and equipment damage.
Compressor: The compressor motor is hermetically sealed and does not require additional oiling.
Motors: Indoor and outdoor fan motors are permanently lubricated and do not require additional oiling.
Outdoor Coil Cleaning: Qualified servicers should clean the outdoor coil to maintain airflow and prevent equipment damage. The manual advises against constructing fences or decks that restrict airflow.
Troubleshooting: The manual includes detailed troubleshooting charts for unitary diagnostic codes, listing symptoms, LED display codes, fault descriptions, possible causes, corrective actions, and notes/cautions.
Pre-Service Checks: Before calling a servicer, users are advised to check thermostat settings, wait 15 minutes for automatic resets, check electrical panels for tripped breakers or failed fuses, confirm disconnect switch closure, check for outdoor unit obstructions, and verify indoor air inlet/outlet blockage and filter cleanliness.